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Resource freshness and replicationRelated Patent Categories: Electrical Computers And Digital Processing Systems: Multicomputer Data Transferring, Computer Network Managing, Network Resource AllocatingResource freshness and replication description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070168516, Resource freshness and replication. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATION [0001] This application claims the benefit of U.S. Provisional Application No. 60/742,508, filed Dec. 5, 2005, entitled CONTENT FRESHNESS AND REPLICATION, which application is incorporated herein in its entirety. BACKGROUND [0002] Systems for replicating resources are becoming increasingly important to ensure availability and fault tolerance in large networks. Corporate networks that replicate files containing domain credentials and policies are one example where availability, scalability, consistency, and reliability are needed. Creating a flexible resource replication system that allows various replication behaviors, however, is challenging. SUMMARY [0003] Briefly, aspects of the subject matter described herein relate to resource replication systems. In aspects, a mechanism is described that detects when local resources are stale. Local resources may be stale when the time between a last successful synchronization activity and a current time exceeds a staleness value. If the local resources are determined to be stale, the local member may refrain from certain synchronization activities until the local member is allowed to resume these certain synchronization activities. If the local resources are not stale, additional synchronization activities including synchronizing resources between the member and an upstream or downstream partner may be performed. [0004] This Summary is provided to briefly identify some aspects of the subject matter that is further described below in the Detailed Description. This Summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. [0005] The phrase "subject matter described herein" refers to subject matter described in the Detailed Description unless the context clearly indicates otherwise. The term "aspects" should be read as "one or more aspects". Identifying aspects of the subject matter described in the Detailed Description is not intended to identify key or essential features of the claimed subject matter. [0006] The aspects described above and other aspects will become apparent from the following Detailed Description when taken in conjunction with the drawings, in which: BRIEF DESCRIPTION OF THE DRAWINGS [0007] FIG. 1 is a block diagram representing a computer system into which aspects of the subject matter described herein may be incorporated; [0008] FIG. 2 is a block diagram that generally represents machines participating in a replica group in accordance with aspects of the subject matter described herein; [0009] FIG. 3 is a block diagram representing a machine configured to operate in a resource replication system in accordance with aspects of the subject matter described herein; and [0010] FIG. 4 is a flow diagram that generally represents actions that may occur in determining whether content on a local machine is fresh enough to synchronize with other members of a replica group in accordance with aspects of the subject matter described herein; [0011] FIG. 5 is a flow diagram that generally represents actions that may occur when a member is determined to have stale content and is set as a slave to recover content in accordance with aspects of the subject matter described herein; and [0012] FIG. 6 is a flow diagram that generally represents actions that may occur when a member is determined to have stale content and is set to merge content with an upstream partner in accordance with aspects of the subject matter described herein. DETAILED DESCRIPTION Exemplary Operating Environment [0013] FIG. 1 illustrates an example of a suitable computing system environment 100 on which aspects of the subject matter described herein may be implemented. The computing system environment 100 is only one example of a suitable computing environment and is not intended to suggest any limitation as to the scope of use or functionality of aspects of the subject matter described herein. Neither should the computing environment 100 be interpreted as having any dependency or requirement relating to any one or combination of components illustrated in the exemplary operating environment 100. [0014] Aspects of the subject matter described herein are operational with numerous other general purpose or special purpose computing system environments or configurations. Examples of well known computing systems, environments, and/or configurations that may be suitable for use with aspects of the subject matter described herein include, but are not limited to, personal computers, server computers, hand-held or laptop devices, multiprocessor systems, microcontroller-based systems, set top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like. [0015] Aspects of the subject matter described herein may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, and so forth, which perform particular tasks or implement particular abstract data types. Aspects of the subject matter described herein may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices. [0016] With reference to FIG. 1, an exemplary system for implementing aspects of the subject matter described herein includes a general-purpose computing device in the form of a computer 110. Components of the computer 110 may include, but are not limited to, a processing unit 120, a system memory 130, and a system bus 121 that couples various system components including the system memory to the processing unit 120. The system bus 121 may be any of several types of bus structures including a memory bus or memory controller, a peripheral bus, and a local bus using any of a variety of bus architectures. By way of example, and not limitation, such architectures include Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MCA) bus, Enhanced ISA (EISA) bus, Video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus also known as Mezzanine bus. [0017] Computer 110 typically includes a variety of computer-readable media. Computer-readable media can be any available media that can be accessed by the computer 110 and includes both volatile and nonvolatile media, and removable and non-removable media. By way of example, and not limitation, computer-readable media may comprise computer storage media and communication media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by the computer 110. Communication media typically embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media. The term "modulated data signal" means a signal that has one or more of its characteristics set or changed in such a manner as to encode information in the signal. By way of example, and not limitation, communication media includes wired media such as a wired network or direct-wired connection, and wireless media such as acoustic, RF, infrared and other wireless media. Combinations of any of the above should also be included within the scope of computer-readable media. [0018] The system memory 130 includes computer storage media in the form of volatile and/or nonvolatile memory such as read only memory (ROM) 131 and random access memory (RAM) 132. A basic input/output system 133 (BIOS), containing the basic routines that help to transfer information between elements within computer 110, such as during start-up, is typically stored in ROM 131. RAM 132 typically contains data and/or program modules that are immediately accessible to and/or presently being operated on by processing unit 120. By way of example, and not limitation, FIG. 1 illustrates operating system 134, application programs 135, other program modules 136, and program data 137. 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